James palmer robertson



N NE m m E m Mr M .PG

(No Model.)

Patented Nov. 28, 1893.

W fliform/ UNITED STATES PATENT OFFICE.

.TAMES PALMER ROBERTSON, OF LONDON, ENGLAND.

CAR-PROPELLER.

SPECIFICATION forming part of Letters Patent N 0. 509,491, dated November 28, 1893.

Application filed June 13, 1892. Serial No. 436,633. (No model.)

To aZZ whom it may concern: A is the lever of which the handle is shown 40 Be it known thatLJAMEs PALMER ROBERT- broken away. It is fulcrumed on the bolt B SON, a subject of the Queen of Great Britain, which connects the side jaws C moving in residing at 19 Garlick Hill, London,England, slots D D therein. The bolt B carries also have invented a certain new and useful Imthe curved plate or wedge piece E the upper provement in Car-Propellers, of which the folpart of which is shaped or made in any suitlowing is aspecification. able way to possess the divergement faces e e The object of this invention is to provide a which by the drawing down of the bolt B due cheaply constructed instrument for use in to the pressure of the lever slide against and to starting railroad trucks and other vehicles press apart the upper ends 0 c of the plates or upon railways and thus facilitate thehandling jaws O O and thus rocking them under the of such vehicles in shunting operations. head and nut respectively of the bolt B bring To this end the instrument consists of a letheir lower edges 01 dtogether to grip the head ver, the fulcrum of which is supported by or of the rail lying between them.

I5 from a doubled plate the upperpart of which F F are pins fastened in the one jaw O and is bent outwardly to act as a wedge lying beprojecting through holes in the other jaw O. tween two jaws or clamp plates, the upper These pins form a rest for the instrument on ends of which are connected by links to the the upper face of the rail. G G are rings or outwardly bent parts of the aforesaid wedge links connecting the ends of the jaws O O with 20 plate, andthe lower ends of which are adapted the wedge piece or plate E.

to grasp the rail on which rests the respective I claimcar which is to be moved, so that when the in- A car propeller or pinch bar havinga lever strument is inserted with the point of the 10- A, a pivotal cross bolt B therefor, side plates ver between the tire of the Wheel of the car, 0 O with slots D D therein, for reception of 25 and the rail, downward pressure on the opposaid cross bolt, a bent plate E having its ends site end of the lever willdraw down the wedge connected to said cross bolt and having its between the jaws, separating their upper ends upper part bent laterally outward to form diand causing their lower ends to grasp the rail verging wedge faces e e bearing on the upper and thus provide a stationary fulcrum for the ends of said plates O G, and links G G con- 30 lever in the action of propelling the car. By necting said plates 0 C, respectively, to plate shifting the lever along the rail after the re- E, the whole substantially as set forth. 7o ceding car, the lifting of the lever disengages In witness whereof I have signed this specithe clamp so that the engagement and disenfication in presence of two witnesses. gagement of the latter automatically follow 3 5 the movement of the lever. JAMES PALMER ROBERTSON.

The annexed drawings illustrate a shunting lever or pinch bar constructed accord- Witnesses: ing to this invention, Figure 1 being a side R. HADDAN,

A. E. MELI-IUISH.

elevation, Fig. 2 a front or end elevation. 

